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  # DWIMmy TSV
  if ($self->from_tsv ||
      (!$self->has_from_tsv && $self->input && $self->input =~ /\.tsv$/)) {
    $self->sep_char("\t");
  }
  if ($self->to_tsv ||
      (!$self->has_to_tsv && $self->output && $self->output =~ /\.tsv$/)) {
    $self->output_sep_char("\t");
  }

  $self->_input_csv(Text::CSV->new({
      map { $_ => $self->$_ } keys %TextCSVOptions }));
  $self->_output_csv(Text::CSV->new({
      map { my $o = "output_$_"; $_ => $self->$o } keys %TextCSVOptions }));

  # If columns aren't specified, look for the --fields option. It allows
  # use of named fields, list of comma-separated fields list, field
  # ranges and so on.

  if (@columns) {
    warn "--fields (-f) option is ignored since columns are also specified." if $self->fields;
  } else {
    my @fields = $self->fields ? @{$self->fields} : ();
    if (@fields) {
      my $columns = $self->_fields_to_columns(\@fields);
      $self->columns($columns);
    }
  }
}

{
  my $line_read;

  # Read a line from input, but push it back for later reading.
  sub _peek_line {
    my ($self) = @_;

    $line_read = $self->_input_csv->getline($self->_input_fh);
  }

  # If there is a line already read, return it; otherwise, read from input.
  sub _get_line {
    my ($self) = @_;

    my $line;
    if ($line_read) {
      $line = $line_read;
      undef $line_read;
      return $line;
    } else {
      return $self->_input_csv->getline($self->_input_fh);
    }
  }
}

sub run {
  my($self) = @_;
  $self->init;

  # L<perlsyn/"modifiers don't take loop labels">
  INPUT: { do {
    my $data;
    while (defined($data = $self->_get_line)) {
      if ($self->columns) {
        @$data = @$data[@{ $self->columns }];
      }
      
      if (!$self->_output_csv->print($self->_output_fh, $data)) {
        warn $self->format_error("Warning - Output error", diag => [$self->_input_csv->error_diag]), "\n";
        next INPUT;
      }
      $self->_output_fh->print("\n");
    }

    # Keeps us going on input errors.
    # TODO: strict errors, according to command line, blah
    if (not defined $data) {
      last INPUT if $self->_input_csv->eof;
      warn $self->format_error("Warning - Input error", line => $., diag => [$self->_input_csv->error_diag]), "\n";
    }
  } }
}

sub format_error {
    my $self = shift;
    my $msg  = shift;
    my %args = @_;

    $msg .= ", line $args{line}"
        if defined $args{line};

    if ($args{diag}) {
        my ($code, $err, $pos, $record) = @{ $args{diag} || [] };
        $msg .= ": " . join " - ",
            $code, $err, "position $pos",
            (defined $record ? "record $record" : ());
    }
    return $msg;
}

1;

__END__
=head1 NAME

App::CSV - process CSV files

=head1 REDIRECTION

Please see L<csv>.

=head1 COPYRIGHT (The "MIT" License)

Copyright 2013 Gaal Yahas.

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

=cut